Synthesis and photovoltaic properties of n-type conjugated polymers alternating 2,7-carbazole and arylene diimides

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• 作者：Xiaolian Hu ; Lijian Zuo ; Hongbin Pan ; Feng Hao ; Junying Pan ; Lei Fu ; Minmin Shi ; Hongzheng Chen
• 关键词：N-type polymers ; 2 ; 7-Carbazole ; Arylene diimides ; Polymer solar cells
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：103
• 期：Complete
• 页码：157-163
• 全文大小：639 K

文摘

A series of conjugated polymers were designed and synthesized via the alternating copolymerization of the electron-donating monomer 2,7-carbazole and electron-accepting monomers of naphthalene diimide (NDI), dithienyl-naphthalene diimide (DTNDI), perylene diimide (PDI) and dithienyl-perylene diimide (DTPDI), respectively. The obtained four copolymers showed good thermal stability as well as broad absorptions in visible region and narrow optical band gaps (1.86-1.59 eV). Through cyclic voltammetry (CV) measuremnts, it was found that all copolymers were n-type semiconductive materials. The copolymers' photovoltaic properties were evaluated when the blends of poly(3-hexyl thiophene) (P3HT) and copolymers were used as the active layers of polymer solar cells (PSCs): among four copolymers, the copolymer alternating 2,7-carbazole and DTPDI units (PCDTPDI) exhibited the best photovoltaic performance with an open-circuit voltage (V_oc) of 0.48 V, a short circuit current density (J_sc) of 3.40 mA/cm², fill factor (FF) of 0.42, and a power conversion efficiency (PCE) of 0.68 % .